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能源供應(yīng)點(diǎn)的功率（Sknet）值。但是，如果
短路電流Iknet已知，功率值可通過(guò)以下方式獲得：
對(duì)于三相系統(tǒng)，使用以下公式：
你在哪里
是電源點(diǎn)的額定電壓。
如果上述數(shù)據(jù)不可用，則在
下表可作為參考值：
凈電壓Ur
[kV]短路功率Sknet[MVA]
高達(dá)20 500
高達(dá)32 750
高達(dá)63 1000
發(fā)電機(jī)
短路功率來(lái)自：
其中X*
d%是次瞬態(tài)電抗（Xd）的百分比值
”
)或
瞬態(tài)電抗（Xd
’
)或同步電抗（Xd），根據(jù)
評(píng)估短路功率值的瞬間。
通常，電抗用額定阻抗的百分比表示
發(fā)電機(jī)（Zd）的計(jì)算公式如下：
你在哪里
和Sr
是發(fā)電機(jī)的額定電壓和功率。
典型值可以是：
-Xd公司
“從10%到20%；
-Xd’從15%到40%；
-Xd從80%到300%。
通常，考慮壞的情況，即亞瞬態(tài)電抗。
下表給出了短路功率的近似值
發(fā)電機(jī)（Xd
”
= 12.5 %):
Sr公司
[千伏安]50 63 125 160 200 250 320 400 500 630 800 1000 1250 1600 2000 2500 3200 4000
Skgen[MVA]0.4 0.5 1.0 1.3 1.6 2.0 2.6 3.2 4.0 5.0 6.4 8.0 10.0 12.8 16.0 20.0 25.6 32.0

power (Sknet) value at the point of energy supply. However, if the value of the short-circuit current Iknet is known, the value of the power can be obtained by using, for three-phase systems, the following formula: where Ur is the rated voltage at the point of energy supply. If the aforementioned data are not available, the values for Sknet given in the following table can be taken as reference values: Net voltage Ur [kV] Short-circuit power Sknet [MVA] Up to 20 500 Up to 32 750 Up to 63 1000 Generator The short-circuit power is obtained from: where X* d% is the percentage value of the subtransient reactance (Xd ” ) or of the transient reactance (Xd ’ ) or of the synchronous reactance (Xd), according to the instant in which the value of the short-circuit power is to be evaluated. In general, the reactances are expressed in percentages of the rated impedance of the generator (Zd) given by: where Ur and Sr are the rated voltage and power of the generator. Typical values can be: - Xd ” from 10 % to 20 %; - Xd’ from 15 % to 40 %; - Xd from 80 % to 300 %. Normally, the worst case is considered, that being the subtransient reactance. The following table gives the approximate values of the short-circuit power of generators (Xd ” = 12.5 %): Sr [kVA] 50 63 125 160 200 250 320 400 500 630 800 1000 1250 1600 2000 2500 3200 4000 Skgen [MVA] 0.4 0.5 1.0 1.3 1.6 2.0 2.6 3.2 4.0 5.0 6.4 8.0 10.0 12.8 16.0 20.0 25.6 32.0